Car audio, explained simply
New to car audio? Here's what each part does, whether you need it, and roughly what it costs, with real examples from our shelves. Our advice: start with speakers. It's the upgrade you'll hear the most.
Soundproofing and power upgrades don't sit in this chain. They help every part do its job better.
Speakers
The parts that actually make the sound. Factory speakers are built to a budget, so better speakers are the upgrade you'll hear the most.
- What it does for you
- Clearer vocals, more detail and less harshness when you turn the volume up.
- Do you need it?
- Almost everyone does. It's step one. Many cars have plug-and-play sets that fit the factory mounts.
- Tweeter: a small speaker for the high notes, like cymbals and the crispness in voices.
- Midrange: a 3–4" speaker for voices and most instruments.
- Midbass (midwoofer): a 6.5–8" door speaker for kick drums and warmth.
- Component set: a separate tweeter and midbass, with a crossover splitting the sound between them. The clearest option.
- Coaxial: the tweeter sits in the middle of the woofer. A simple swap, great for rear doors.
Examples from our store
Subwoofer
A speaker just for the deepest bass, the notes small door speakers can't reach.
- What it does for you
- Bass you can feel as well as hear. It also takes the strain off your door speakers, so they sound cleaner.
- Do you need it?
- If you like your bass, or your car has small door speakers. Usually step three, after speakers and a DSP.
- Under-seat: slim, hidden under a seat, so you keep your boot space. Many BMWs and Minis have a factory spot for one.
- Boot or spare-tyre: a bigger box for deeper bass. Spare-tyre models hide in the wheel well.
- Active: has its own amplifier built in, so it's simpler to fit.
Examples from our store
Amplifier
Gives your speakers more clean power than the car's stereo can.
- What it does for you
- Factory stereos have small built-in amps. A proper amplifier lets good speakers play louder without distortion, with tighter, more controlled bass.
- Do you need it?
- When you upgrade to speakers that want more power, or add a subwoofer that isn't active. In most of our builds, a DSP amplifier does this job.
Examples from our store
DSP (digital sound processor)
A small computer that tunes the sound to your car's cabin.
- What it does for you
- In a car you sit right next to one speaker and far from the other, and the cabin makes some notes boom and others sound harsh. A DSP adjusts the timing, tone and volume of each speaker separately, so the music sounds centred on the dashboard in front of you, like a stage.
- Do you need it?
- It's the biggest step up after speakers. Many modern cars, especially BMW, Mercedes and EVs, already process the sound at the factory. A DSP lets us undo that and tune it properly. We tune every DSP ourselves.
Examples from our store
Standalone DSPs like these are for high-end systems with separate amplifiers. Most of our builds use a DSP amplifier instead.
DSP amplifier
A DSP and an amplifier in one box.
- What it does for you
- Tunes the sound and powers your speakers, so you get both upgrades with less wiring and less space. Many connect to the car with a plug-and-play harness.
- Do you need it?
- It's what we fit most often alongside new speakers. The number of channels (6, 8, 12…) is how many speakers it can tune and power separately.
Examples from our store
Soundproofing
Damping and insulating layers fitted inside the doors, footwells, wheel arches, boot or bonnet.
- What it does for you
- Stops metal panels ringing and blocks noise coming in from the tyres, road and engine. The cabin gets quieter, and your speakers sound tighter, especially the bass.
- Do you need it?
- It depends on which noise bothers you. Each of our packages treats one area, so you only pay for the part of the car that's noisy. Find your noise in the list.
Which package for which noise?
Power & grounding
Cleaner electrical power for your audio system.
- What it does for you
- A car's electrical system is noisy. Power filters and grounding upgrades reduce that noise, for a quieter background and cleaner detail. A capacitor steadies the voltage when a big amplifier needs a burst of power.
- Do you need it?
- It's optional, a finishing touch for higher-end systems once everything else is in place.
Examples from our store
Plug-and-play
Upgrades made to fit your car's factory mounts and wiring.
- What it means
- Car-specific speakers and harnesses plug into the original connectors. No cutting, no splicing, and everything can go back to stock, so your car warranty is safe.
- Which cars?
- Many BMW, Mini and Mercedes models have plug-and-play options, and so do some other cars. Tell us your car and we'll check what fits.
Made for your car
Our advice: speakers first
Upgrade in steps, and every step builds on the last. Tap a car to see a real build and its prices.
Better speakers
Replace the factory speakers. It's the biggest difference for the money, and often plug-and-play.
Add a DSP
Tune those speakers to your car, usually with a DSP amplifier. The music moves onto the dashboard, in front of you.
Bass and quiet
Add a subwoofer for depth, and soundproofing for a calmer cabin and tighter bass.
Words you'll hear
- Head unit
- Your car's stereo or screen, where the music comes from.
- Watts (RMS)
- The power an amplifier delivers, or a speaker can handle, continuously. RMS is the honest number; ignore "peak" figures.
- Ohms
- A speaker's electrical load. The amplifier and speakers need to match.
- Crossover
- Sends the high notes to the tweeter and the low notes to the woofer.
- Channels
- The separate outputs of an amplifier or DSP. One channel per speaker gives the most control.
- Time alignment
- Delaying the speakers nearest you, so all the sound reaches your ears at the same moment.
- Sound stage
- Where the music seems to come from. A good system spreads it across the dashboard.
- Active subwoofer
- A subwoofer with its own amplifier built in.
Tell us your car, we'll suggest a first step
Or come and hear the difference in our demo room, with your own music.